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Installation Instructions for Heating & Air Conditioning 1E78 5/2 Day Programmable Thermostat CONTENTS Preparations .................................................. 1 Thermostat Details ........................................ 1 Removing Old Thermostat ............................. 1 Mounting and Wiring...................................... 2 Check Thermostat Operation......................... 3 Programming your Thermostat ...................... 4 Specifications ................................................ 6 Troubleshooting ............................................. 6 1 PREPARATIONS 2 THERMOSTAT DETAILS 3 REMOVING OLD THERMOSTAT Before removing wires from old thermostat’s switching subbase, label each wire with the terminal designation it was removed from. 1. Remove Old Thermostat: A standard heat/cool thermostat consists of three basic parts: a. The cover, which may be either a snap-on or hinge type. b. The base, which is removed by loosening all captive screws. c. The switching subbase, which is removed by unscrewing the mounting screws that hold it on the wall or adaptor plate. 2. Shut off electricity at the main fuse box until installation is com- plete. Ensure that electrical power is disconnected. 3. Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall. If the old thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly. 4. Identify each wire attached to the old thermostat. 5. Disconnect the wires from the old thermostat one at a time. DO NOT LET WIRES FALL BACK INTO THE WALL. 6. Install new thermostat using the following procedures. To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker until installation is complete. PART NO. 37-6542C Replaces 37-6542B 1026 Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage Assemble tools required as shown below. WIRE CUTTER/STRIPPER HAND OR POWER DRILL WITH 3/16 INCH DRILL BIT, IF NEEDED FLAT BLADE SCREWDRIVER YOUR THERMOSTAT REPLACES Typical System Compatibility Chart 1E78 Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt) Yes Electronic Ignition Heat Only Two Wire Systems (24 volt) Yes Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt) Yes Standard Heat/Cool Systems (24 volt) Yes Heat/Cool Systems Electric Heat (24 volt) Yes Heat Only Electric Heat Systems (24 volt) Yes Cool Only Systems (24 volt) Yes Heat Pump Systems (No Aux. or Emergency Heat) Yes Hot Water Zone Heat Only (Two Wire) Systems Yes Hot Water Zone Heat Only (Three Wire) Systems No Line Voltage Heating or Baseboard 110/240 Volt Systems No Millivolt Systems Floor or Wall Furnaces Yes 12 VDC Mobile Home Application Yes Multistage Systems No Systems Exceeding 30VAC, 1.5 Amp No CAUTION ! Base Back of Thermostat Body RC ELEC GAS G RH Y O B W W903 W904 W905 Elec/Gas Switch Mounting Hole Mounting Hole Figure 1. Thermostat W903 - clip to disable EMR feature W904 - clip for Celcius display W905 - clip for hydronic system NOTE: Earlier models refer to 37-7006 for jumper locations. www.white-rodgers.com www.emersonclimate.com

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Installation Instructions for

Heating & Air Conditioning

1E785/2 Day Programmable Thermostat

CONTENTS

Preparations .................................................. 1Thermostat Details ........................................ 1Removing Old Thermostat ............................. 1Mounting and Wiring ...................................... 2Check Thermostat Operation ......................... 3Programming your Thermostat ...................... 4Specifications ................................................ 6Troubleshooting ............................................. 6

1 PREPARATIONS

2 THERMOSTAT DETAILS 3 REMOVING OLD THERMOSTAT

Before removing wires from old thermostat’s switching subbase, label each wire with the terminal designation it was removed from.

1. Remove Old Thermostat: A standard heat/cool thermostat consists of three basic parts:a. The cover, which may be either a snap-on or hinge type.b. The base, which is removed by loosening all captive screws.c. The switching subbase, which is removed by unscrewing

the mounting screws that hold it on the wall or adaptor plate.

2. Shut off electricity at the main fuse box until installation is com-plete. Ensure that electrical power is disconnected.

3. Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall. If the old thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.

4. Identify each wire attached to the old thermostat.5. Disconnect the wires from the old thermostat one at a time. DO

NOT LET WIRES FALL BACK INTO THE WALL.6. Install new thermostat using the following procedures.

To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker until installation is complete.

PART NO. 37-6542CReplaces 37-6542B

1026

Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage

Assemble tools required as shown below.

WIRE CUTTER/STRIPPER

HAND OR POWER DRILL WITH 3/16 INCH DRILL BIT, IF NEEDED

FLAT BLADE SCREWDRIVER

YOUR THERMOSTAT REPLACESTypical System Compatibility Chart 1E78Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt) YesElectronic Ignition Heat Only Two Wire Systems (24 volt) YesElectronic Ignition Heat Only Gas or Oil Fired Systems (24 volt) YesStandard Heat/Cool Systems (24 volt) YesHeat/Cool Systems Electric Heat (24 volt) YesHeat Only Electric Heat Systems (24 volt) YesCool Only Systems (24 volt) YesHeat Pump Systems (No Aux. or Emergency Heat) YesHot Water Zone Heat Only (Two Wire) Systems YesHot Water Zone Heat Only (Three Wire) Systems NoLine Voltage Heating or Baseboard 110/240 Volt Systems NoMillivolt Systems Floor or Wall Furnaces Yes12 VDC Mobile Home Application YesMultistage Systems NoSystems Exceeding 30VAC, 1.5 Amp No

CAUTION!

Base Back of Thermostat Body

RC

ELEC GAS

G RH

Y O B

W

W903W904

W905

Elec/GasSwitchMounting

Hole

MountingHole

Figure 1. Thermostat

W903 - clip to disable EMR featureW904 - clip for Celcius displayW905 - clip for hydronic system

NOTE: Earlier models refer to 37-7006 for jumper locations.

www.white-rodgers.comwww.emersonclimate.com

www.white-rodgers.com

ATTENTION! This product does not contain mercury. However, this product may replace a unit which contains mercury.Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing non-absorbent gloves, take up the spilled mercury and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded.Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable con-tainer. Refer to www.white-rodgers.com for location to send product containing mercury.

Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.

Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage thermostat and could cause personal injury and/or property damage.

Thermostat installation and all components of the system shall conform to Class II circuits per the NEC code.

TERMINAL CROSS REFERENCE CHART

New ThermostatTerminal Designation

Other Manufacturers’Terminal Designation

RH

RC

G

W

Y

4

R

G

W

Y

RH

R

G

W

Y

M

V

F

H

C

R5

-

G

4

Y6

R

-

G

W

Y

* *

* These are four-wire, single-transformer systems. Factory installed jumper wire between the RH and RC terminals must remain in place.

Electric Heat or Single-Stage Heat Pump Systems

This thermostat is configured from the factory to operate a heat/cool, fossil fuel (gas, oil, etc.), forced air system. It is configured correctly for any system that DOES NOT require the thermostat to energize the fan on a call for heat. If your system is an electric or heat-pump system that REQUIRES the thermostat to turn on the fan on a call for heat, locate the GAS/ELECTRIC switch (see fig. 1) and switch it to the ELECTRIC position. This will allow the thermostat to energize the fan immediately on a call for heat. If you are unsure if the heating/cooling system requires the thermostat to control the fan, contact a qualified heating and air conditioning service person.

Hydronic (Hot Water or Steam) Heating Systems

This thermostat is set to operate properly with a forced-air heating system. If you have a hydronic heating system (a system that heats with hot water or steam), you must set the thermostat to operate properly with your system.

The factory default setting is forced air heat. Clipping jumper W905 on the circuit board will produce a longer heating cycle which is normally for hot water or steam (hydronic) systems. Both settings produce a very accurate temperature control and can be set to your personal preference. As received, the thermostat cycles the system just under 1˚F. With W905 clipped, the system cycles at approximately 1.5˚F.

Energy Management Recovery (EMR)This thermostat is set to operate with EMR. This causes the thermostat to start the heating or cooling system early to have the room temperature reach the program setpoint at the time the period is to start.

To disable EMR, clip jumper W903 (see Fig. 1).

Attach Thermostat Base to Wall1. Remove the packing material from the thermostat. Gently pull the

thermostat body straight off the base. Forcing or prying on the thermostat will cause damage to the unit. If necessary, move the electric heat switch (see ELECTRIC HEAT SYSTEMS, above).

2. Connect wires beneath terminal screws on base using appropri-ate wiring schematic (see figs. 2 through 7).

3. Place base over hole in wall and mark mounting hole locations on wall using base as a template.

4. Move base out of the way. Drill mounting holes.5. Fasten base loosely to wall, as shown in fig. 1, using two mount-

ing screws. Adjust until level, and then tighten screws. (Leveling is for appearance only and will not affect thermostat operation.) If you are using existing mounting holes, or if holes drilled are too large and do not allow you to tighten base snugly, use plastic screw anchors to secure subbase.

6. Push excess wire into wall and plug hole with a fire-resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.

Battery LocationThis thermostat requires 2 “AAA” alkaline batteries to operate.

If appears on the display, the batteries are low and should be replaced with fresh “AAA” Energizer® alkaline batteries. The batteries are located on the back of the thermostat body (see fig. 1).

3 REMOVING OLD THERMOSTAT CONTINUED FROM FIRST PAGE

4 MOUNTING AND WIRING

WARNING!

Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat. Personal injury and/or property damage may occur.

CAUTION!

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NOTETo prevent static discharge problems, touch side of thermostat to release static build-up before touching any keys.

RH

24 VAC 120 VAC

Hot

Neutral

THERMOSTAT

SYSTEMG W

Figure 2. Typical wiring diagram forheat only, 3-wire, single transformer systems

TRANSFORMER

HeatingSystem

FanRelay

Y RC

JUMPERWIRE

OB

For 2-wire Heat only, attach to RH and W

NOTE

RHY

24 VAC 120 VAC

Hot

Neutral

TRANSFORMER

THERMOSTAT

SYSTEMG W

Figure 3. Typical wiring diagram forcool only, 3-wire, single transformer systems

CoolingSystem

FanRelay

RCOB

JUMPERWIRE

RHY

24 VAC 120 VAC

Hot

Neutral

THERMOSTAT

SYSTEMG W

Figure 4. Typical wiring diagram forheat/cool, 4-wire, single transformer systems

TRANSFORMER

HeatingSystem

FanRelay

CoolingSystem

RC

JUMPERWIRE

OB

RED jumper wire (provided with thermostat) must be connected between thermostat RH and RC terminals for proper thermostat operation with this system.

NOTE

RHY

24 VAC 120 VAC

Hot

Neutral

THERMOSTAT

SYSTEMG W

Figure 5. Typical wiring diagram forheat/cool, 5-wire, two-transformer systems

HEATINGTRANSFORMER

HeatingSystem

FanRelay

CoolingSystem

RC

24 VAC 120 VAC

Hot

Neutral

COOLING TRANSFORMER

OB

RHY

24 VAC 120 VAC

Hot

Neutral

THERMOSTAT

SYSTEMG W

Figure 6. Typical wiring diagram for heat pumpwith reversing valve energized in COOL

TRANSFORMER

ReversingValve*

RCOB

JUMPERWIRE

CompressorContactor

JUMPERWIRE

* Reversing valve is energized when the system switch is in the COOL position

FanRelay

RHY

24 VAC 120 VAC

Hot

Neutral

THERMOSTAT

SYSTEMG W

Figure 7. Typical wiring diagram for heat pumpwith reversing valve energized in HEAT

TRANSFORMER

ReversingValve*

RCOB

JUMPERWIRE

CompressorContactor

JUMPERWIRE

* Reversing valve is energized when the system switch is in the HEAT position

FanRelay

Fan OperationIf your system does not have a G terminal connection, skip to Heating System.

1. Turn on power to the system.2. Move FAN switch to ON position. The blower should begin to

operate.3. Move FAN switch to AUTO position. The blower should stop im-

mediately.

Cooling System

This thermostat has a time delay between cooling cycles to allow the head pressure in the compressor to stabilize. If the temperature is adjusted to call for cool within 5 minutes of the last cycle the snow-flake icon will blink indicating the thermostat is locked out. After 3 to 5 minutes, the compressor will start and the snowflake icon will stop flashing. This helps prevent the compressor from cycling too quickly and is normal operation for the thermostat.

1. Move SYSTEM switch to COOL position.2. Press to adjust thermostat setting below room temperature.

The blower should come on immediately on high speed, followed by cold air circulation

3. Press to adjust temperature setting above room temperature. The cooling system should stop operating.

Heating System1. Move SYSTEM switch to HEAT position. If the heating system

has a standing pilot, be sure to light it.2. Press to adjust thermostat setting above room temperature.

The heating system should begin to operate.3. Press to adjust temperature setting below room temperature.

The heating system should stop operating.

4 MOUNTING AND WIRING CONTINUED FROM SECOND PAGE

5 CHECK THERMOSTAT OPERATION

To prevent compressor and/or property damage, if the outdoor temperature is below 50°F, DO NOT operate the cooling system.

CAUTION!

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Before you begin programming your thermostat, you should be familiar with its features and with the display and the location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat body and the base. To remove the body, gently pull it straight out from the base. To replace the body, line up the body with the base and press gently until the body snaps onto the base.

The Thermostat Buttons and Switches1 (Up arrow) Raises temperature setting.

2 (Down arrow) Lowers temperature setting.

3 TIME button.

4 PRGM (program) button.

5 RUN (program) button.

6 HOLD button.

7 FAN switch (ON, AUTO).

8 SYSTEM switch (COOL, OFF, HEAT).

The Display9 Indicates day of the week.

10 is displayed when the SYSTEM switch is in the HEAT posi-

tion. is displayed (non-flashing) when the SYSTEM switch

is in the COOL position. is displayed (flashing) when the compressor is in lockout mode.

11 Alternately displays current time and temperature.

12 is displayed when the 2 “AAA” batteries are low and should be replaced. Nothing else will be displayed. Earlier models display “LO BATTERY”. Refer to 37-7006.

13 Displays currently programmed set temperature (this is blank when SYSTEM switch is in the OFF position).

14 “HOLD” is displayed when the thermostat is in the HOLD mode.

Operating FeaturesNow that you are familiar with the thermostat buttons and display, read the following information to learn about the many features of the thermostat.

• SIMULTANEOUS HEATING/COOLING PROGRAM STOR-AGE — When programming, you can enter both your heating and cooling programs at the same time. There is no need to reprogram the thermostat at the beginning of each season.

• TEMPERATURE OVERRIDE — Press or until the display shows the temperature you want. The thermostat will override current programming and keep the room temperature at the selected temperature until the next program period begins. Then the thermostat will automatically revert to the program.

• HOLD TEMPERATURE — The thermostat can hold any tempera-ture within its range for an indefinite period, without reverting to the programmed temperature. Press HOLD button. “HOLD” will be displayed. Then choose the desired temperature by pressing

or . The thermostat will hold the room temperature at the selected setting until you press the RUN button to start program operation again.

• ENERGY MANAGEMENT RECOVERY — Energy Management Recovery (EMR) causes the thermostat to start heating or cool-ing early to make the building temperature reach the program setpoint at the time you specify. Heating will start 5 minutes early for every 1° of temperature required to reach setpoint. Cooling will start approximately 15 minutes early for every 1° because it takes longer to reach temperature. Clipping W903 jumper will disable EMR.Example: You select EMR and have your heating programmed to 65° at night and 70° at 7 AM. If the building temperature is 65° the difference between 65° and 70° is 5°. Allowing 5 minutes per degree the thermostat setpoint will change to 70° at 6:35 AM.

• °F/°C CONVERTIBILITY — The factory default setting is Fahr-enheit. Clipping W904 jumper on the circuit board (see fig. 1) will alter this feature to Celsius temperature setting.

• LOW BATTERY INDICATOR — If the 2 “AAA” alkaline bat-teries are low and should be replaced, the display will be

blank except for . When the batteries are low, pressing any button will cause the display to operate for ten seconds. After ten seconds, the display will return to blank except for

. After has been displayed for 4 weeks, the thermostat will raise the temperature 10 degrees above your setpoint in COOL mode and will drop temperature 10 degrees below your setpoint in HEAT mode. You cannot program with low batteries, but you can override setpoint temperature.

• TEMPERATURE DISPLAY ADJUSTMENT — Your new ther-mostat has been accurately set in our factory. However, if you wish, you may adjust your new thermostat temperature display to match your old thermostat. This can be accomplished (within a ±3° range) as follows:

Figure 8. Thermostat display, buttons and switches

5 CHECK THERMOSTAT OPERATION CONTINUED FROM THIRD PAGE

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1. Press PRGM and RUN buttons at the same time.2. Press or to adjust the displayed temperature

to your desired setting.3. Press RUN to resume normal program operation.

• Display Backlight— The display backlight improves display contrast in low lighting conditions. Selecting backlight ON will turn the light on for a short period of time after any button is pressed. Selecting backlight OFF (default) will keep the light off. Turn the display backlight feature ON as follows:

1. Press TIME and RUN buttons at the same time. The display will show “d-L” and “OFF” alternately.

2. Press or to change “OFF” to “ON”

Entering Your ProgramFollow these steps to enter the heating and cooling programs you have selected.

Set Current Time and Day1. Press TIME button once. The display will show the hour only.

EXAMPLE: PM

2. Press and hold either or until you reach the correct hour and AM/PM designation (AM begins at midnight; PM begins at noon).

3. Press TIME once. The display window will show the minutes only.

EXAMPLE:

4. Press and hold either or until you reach the correct minutes.

5. Press TIME once. The display will show the day of the week.6. Press or until you reach the current day of the week.7. Press RUN once. The display will show the correct time and

room temperature alternately.

Enter Heating Program1. Move the SYSTEM switch to HEAT.2. Press PRGM once. “MO TU WE TH FR” (indicating weekday

program) will appear in the display. Also displayed are the cur-rently programmed start time for the 1st heating period and the currently programmed temperature (flashing).

EXAMPLE: AM

MO TU WE TH FR

This display window shows that for the 1st weekday period, the start time is 6:00 AM, and 70° is the programmed temperature (this example reflects factory preprogramming).

3. Press or to change the displayed temperature to your selected temperature for the 1st heating program period.

4. Press TIME once (the programmed time will flash). Press or until your selected time appears. The time will change in 15 minute increments. When your selected time is displayed, press TIME again to return to the change temperature mode.

5. Press PRGM once. The currently programmed start time and setpoint temperature for the 2nd heating program period will appear.

This section will help you plan your thermostat’s program to meet your needs. For maximum comfort and efficiency, keep the following guidelines in mind when planning your program.

• Whenheating(cooling)yourbuilding,programthetemperaturesto be cooler (warmer) when the building is vacant or during periods of low activity.

• During early morning hours, the need for cooling is usuallyminimal.

Look at the factory preprogrammed times and temperatures shown below. If this program will suit your needs, simply press the RUN button to begin running the factory preset program.If you want to change the preprogrammed times and temperatures, follow these steps.

Determine the time periods and temperatures for your weekday and weekend programs. You must program four periods for both the weekday and weekend program. However, you may use the same heating and cooling temperatures for consecutive time periods. You can choose start times, heating temperatures, and cooling tempera-tures independently for both weekday and weekend programs (for example, you may select 5:00 AM and 70° as the weekday 1st period heating start time and temperature, and also choose 7:00 AM and 76° as the weekday 1st period cooling start time and temperature). Use the table at the bottom of the page to plan your program time periods and the temperatures you want during each period. You may also want to look at the sample program table to get an idea of how the thermostat can be programmed.

6 PROGRAMMING YOUR THERMOSTAT

WEEKDAY (5 DAY) WEEKEND (2 DAY)

StartTime Temperature

StartTime Temperature

Heating/Cooling Schedule Plan

Period

CO

OL

1ST

2ND

3RD

4TH

1ST

2ND

3RD

4TH

CO

OL

HE

AT

1ST

2ND

3RD

4TH

1ST

2ND

3RD

4TH

SAMPLEHeating/Cooling Schedule Plan (Factory Program)

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

70 F

62 F

70 F

62 F

78 F

85 F

78 F

82 F

70 F

62 F

70 F

62 F

78 F

85 F

78 F

82 F

WEEKDAY (5 DAY) WEEKEND (2 DAY)

StartTime Temperature

StartTime TemperaturePeriod

CO

OL

HE

AT

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6. Repeat steps 4 and 5 to select the start time and heating tem-perature for the 2nd heating program period.

7. Repeat steps 4 through 6 for the 3rd and 4th heating program periods. Weekday heating programs are now complete.

8. Press PRGM once. “SA SU” (indicating weekend program) will appear in the display, along with the start time for the 1st heating period and the currently programmed temperature.

9. Repeat steps 4 through 8 to complete weekend heating program-ming.

10. When you have completed entering your heating program, press RUN.

Enter Cooling ProgramIf the outside temperature is below 50°F, disconnect power to the cooling system before programming. Energizing the air conditioner compressor during cold weather may cause personal injury or property damage.

1. Move SYSTEM switch to COOL position.2. Follow the procedure for entering your heating program, using

your selected cooling times and temperatures.

Check Your ProgrammingFollow these steps to check your thermostat programming one final time before beginning thermostat operation.

1. Move SYSTEM switch to HEAT position.2. Press PRGM to view the 1st weekday heating period time and

temperature. Each time you press PRGM, the next heating period time and temperature will be displayed in sequence for weekday, then weekend program periods (you may change any time or temperature during this procedure).

3. Press RUN.4. Move SYSTEM switch to COOL position.5. Repeat step 2 to check cooling temperatures.6. Press RUN to begin program operation.

YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED AND READY TO AUTOMATICALLY PROVIDE MAXIMUM COMFORT AND EFFICIENCY!

ELECTRICAL DATAElectrical Rating: MV to 30 VAC 50/60 Hz. or D.C. 0.05 to 1.0 Amps (Load per terminal) 1.5 Amps Maximum Total Load (All terminals combined)

THERMAL DATASetpoint Temperature Range: 45°F to 90°F (7°C to 32°C) Operating Ambient Temperature Range: 32°F to 105°F Operating Humidity Range: 0 to 90% RH (non-condensing) Shipping Temperature Range: -40°F to 150°F

Reset OperationIf a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermostat by pressing

, and TIME at the same time. This also resets the factory defaults. If the thermostat has power, has been reset and still does

not function correctly contact your heating/cooling service person or place of purchase.

BatteriesFor optimum performance, we recommend replacing batteries once a year with fresh “AAA” Energizer® alkaline batteries.

6 PROGRAMMING YOUR THERMOSTAT CONTINUED FROM FIFTH PAGE

7 SPECIFICATIONS

8 TROUBLESHOOTING

Symptom Possible Cause Corrective Action

No Heat/No Cool/No Fan(common problems)

Blown fuse or tripped circuit breaker. 1. Furnace power switch to OFF.2. Furnace blower compartment door or panel 3. loose or not properly installed.

Replace fuse or reset breaker.Turn switch to ON.Replace door panel in proper position to engage safety interlock or door switch.

No Heat Pilot light not lit. 1. SYSTEM Switch not set to 2. HEAT.

Loose connection to thermostat or system. 3.

Furnace Lock-Out Condition. Heat may also be 4. intermittent.

Re-light pilot.Set SYSTEM Switch to HEAT and raise setpoint temperature above room temperature.Verify thermostat and system wires are securely attached.Many furnaces have safety devices that shut down when a lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local service person for assistance.

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Symptom Possible Cause Corrective Action

No Heat (continued) 5. Heating system requires service or thermostat requires replacement.

Diagnostic: Set SYSTEM Switch to HEAT and raise the setpoint above room temperature. Within a few seconds the thermostat should make a soft click sound. This sound usually indicates the ther-mostat is operating properly. If the thermostat does not click, try the reset operation listed above. If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact the furnace manufacturer or a service person to verify the heating is operating correctly.

No Cool SYSTEM Switch not set to COOL. 1.

Loose connection to thermostat or system. 2.

Cooling system requires service or thermostat 3. requires replacement.

Set SYSTEM Switch to COOL and lower setpoint temperature below room temperature.Verify thermostat and system wires are securely attached.Same procedure as diagnostic for No Heat condition except set the thermostat to COOL and lower the setpoint below the room temperature. There may be up to a five minute delay before the thermostat clicks in Cooling.

Heat, Cool or Fan Runs Constantly. Possible short in wiring.1. Possible short in thermostat.2. Possible short in heat/cool/fan system.3. FAN Switch set to Fan ON.4.

Check each wire connection to verify they are not shorted or touching together. No bare wire should stick out from under terminal screws. Try resetting the thermostat as described above. If the condition persists the manufacturer of your system or service person can instruct you on how to test the Heat/Cool system for correct operation. If the system operates correctly, replace the thermostat.

Furnace Cycles Too Fast or Too Slow(narrow or wide temperature swing)

The location of the thermostat and/or the size of 1. the Heating System may be influencing the cycle rate.

Digital thermostats normally provide precise temperature control and may cycle faster than some older mechanical models. A faster cycle rate means the unit turns on and off more frequently but runs for a shorter time so there is no increase in energy use. If you would like to increase the cycle time, clip Jumper W-905 as mentioned in the instructions for Hydronic Heating Systems. It is not possible to shorten the cycle time. If an accept-able cycle rate is not achieved as received or by clipping W-905 contact a local service person for additional suggestions.

Cooling Cycles Too Fast or Too Slow (narrow or wide temperature swing)

The location of the thermostat and the size of 1. the Cooling System can influence the cycle rate.

The cycle rate for cooling is fixed and can not be adjusted. Contact a local service person for sug-gestions.

Thermostat Setting and Thermostat Thermometer Disagree

Thermostat thermometer setting requires adjust-1. ment.

The thermometer can be adjusted +/- 3 degrees. See Temperature Display Adjustment in the Operation section.

Thermostat Does Not Follow Program AM or PM set incorrectly in program.1. AM or PM set incorrectly on the clock.2. Voltage spike or static discharge.3.

Check current clock and program settings includ-ing the AM or PM designations for each time pe-riod. If a voltage spike or a static discharge occurs use the Reset Operation listed above.

Blank Display and/or Keypad Not Responding

Voltage spike or static discharge.1. Battery change required.2.

Replace batteries and check heat/cool system for proper operation. If a voltage spike occurs use the Reset Operation listed above.

8 TROUBLESHOOTING CONTINUED FROM SIXTH PAGE

White-Rodgers is a division of Emerson Electric Co.

The Emerson logo is a trademark and service mark of Emerson Electric Co.

Homeowner Help Line: 1-800-284-2925

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